Speaker
Description
The Cosmic Infrared Background (CIB) is sourced by dusty star-forming galaxies, and is thus a biased tracer of large-scale structure. This makes it a promising probe of local-type primordial non-Gaussianity (PNG) through the scale-dependent bias effect that arises in the presence of non-zero local PNG. Tight constraints on the local PNG parameter fNL can help distinguish between different inflationary models, in particular a detection of fNL ∼ O(1) would rule out single field slow roll inflation. I will present constraints on fNL from scale-dependent bias, obtained using cross-correlations alone, where the signal is less sensitive to large-scale foreground systematics. I will be considering the cross-correlation of the CIB with the reconstructed CMB lensing potential, an unbiased tracer of the matter field that is highly correlated with the CIB. I will discuss the resulting constraints, how they compare with other probes of primordial non-Gaussianity, and the prospects for future measurements.